*Excludes Observations that spanned multiple years

Pre 197011
19700
19710
19720
19730
19740
19750
19760
19770
19780
19791
19800
19810
19820
19830
19840
19850
19862
19872
19881
19890
19904
19918
19920
19934
199412
19953
19962
19970
19981
19990
20000
20010
20020
20030
20043
20051
20060
20071
200814
200931
201032
201119
201237
201315
201412
201511
201616
20170
20181
20190
20200
20210
20220
Total244